Run all tox python3

Prepare for Python 3.13, fix issues with numpy>2 & matplotlib, #919

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Run time

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Job	Run time
build (3.8)	1m 34s
build (3.9)	1m 49s
build (3.10)	1m 51s
build (3.11)	1m 25s
build (3.12)	1m 23s
	8m 2s